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Idaho Retirement Taxes (2026): The Flat 5.3% Rate and the CSRS-Not-FERS Trap

Clear Money Guide

What this state guide covers

A quick view of the questions, practical details and source notes below.

The CSRS-not-FERS trap (and the 2025 changes)
How Idaho taxes retirement income (statute-cited)
Probate: reasonable fees and a $100,000 affidavit
Is Idaho a good state to retire in for taxes?

Comparison tables scroll horizontally on smaller screens.

2026 edition · statute-cited · part of Clear Money Guide’s 51-state retirement tax series. This guide covers state taxes on retirement income and estate transfers; property and sales taxes vary by county and are outside its scope.

Updated July 24, 2026. Quick answer: Idaho exempts Social Security and taxes essentially everything else at a flat 5.3% — cut from 5.695% by HB 40 (2025), a figure many guides haven’t caught up with. Pensions, 401(k) and IRA withdrawals get no general exclusion; the state’s Retirement Benefits Deduction (Idaho Code §63-3022A) is far narrower than its name suggests — it covers CSRS but not FERS federal retirees, military retirement, and a short list of Idaho police and firefighter funds, and is reduced by the Social Security and railroad retirement benefits received by either spouse. No estate or inheritance tax.

Federal civil service pensions in Idaho: does Idaho tax federal pensions.

State retirement-income forms, line by line: Idaho Form 39R.

Inherited an IRA? What the state’s own documents say about taxing those withdrawals: Idaho tax on inherited IRA withdrawals.

Hold a 403(b) or 457(b)? What the state’s own documents say about taxing those withdrawals: does Idaho tax 403(b) and 457(b) withdrawals.

Drawing a pension? Whether the state withholds tax from it, from its own documents: Idaho tax withholding on pension payments.

Selling your home? How the state taxes the profit, from its own tax documents: Does Idaho tax the profit from selling your home?.

The state’s income tax schedule: the Idaho 2026 tax brackets (pending).

Withdrawing from an IRA or 401(k)? Whether the state withholds tax from it, from its own documents: Idaho tax withholding on IRA and 401(k) withdrawals.

For trust income specifically: does Idaho tax trust income.

For dividends and interest specifically: does Idaho tax dividends and interest.

Inheriting from, or planning for, someone in this state? Whether the state has an inheritance tax, from its own tax documents: Does Idaho have an inheritance tax?.

Contributing to an HSA? How the state taxes it, from its own tax documents: Does Idaho tax HSA contributions?.

For annuity payments specifically: does Idaho tax annuity income.

Making a gift or planning an estate? The state’s gift tax answer, from its own tax documents: Does Idaho have a gift tax?.

Planning for what you leave behind? The state’s estate tax answer, from its own tax documents: Does Idaho have an estate tax?.

For military retired pay: does Idaho tax military retirement.

Saving for a child’s college? The state’s 529 break has its own page: Idaho 529 plan tax deduction.

For the sale of stocks, funds or real estate: does Idaho tax capital gains.

For 401(k) and IRA withdrawals specifically: does Idaho tax 401(k) and IRA withdrawals.

Before the tax question, the PERSI payment options, refund and buyback rules: PERSI retirement decisions.

Related guides on this topic: Rhode Island Retirement Taxes (2026) and State Taxes When You Retire Abroad.

Related state retirement tax guides: Does Idaho Tax Roth Conversions? 2026.

The CSRS-not-FERS trap (and the 2025 changes)

Idaho’s §63-3022A deduction reads like a broad retiree benefit and isn’t: it applies only to Civil Service Retirement System annuities (the pre-1987 federal system — FERS retirees do not qualify), the Foreign Service system, military retirement, the Idaho Firefighters Retirement Fund, and certain Idaho police pensions — and what it grants, it offsets by Social Security benefits received. Two 2025 updates worth dating: HB 40 cut the flat rate to 5.3%, and retired servicemembers under 62 can qualify if they are disabled or were employed during the year and received enough income from that work to be required to file a federal return. A private-sector retiree gets none of this — 401(k) withdrawals are taxed at 5.3% of Idaho taxable income over $2,500 ($5,000 on a joint return), thresholds the state adjusts each year for inflation.

How Idaho taxes retirement income (statute-cited)

Income taxFlat 5.3% (HB 40, 2025; was 5.695%)
Social SecurityNot taxed (subtracted in full)
Pension / 401(k) / IRAFully taxable — no general retirement exclusion
CSRS / military / listed plansRetirement Benefits Deduction (§63-3022A): federal CSRS and Foreign Service annuitants and the listed Idaho firefighter and police plans must be 65, or 62 and disabled, and married filers must file jointly; military retirees qualify if disabled, 62 or older, or employed with enough income to be required to file a federal return; reduced by Social Security and railroad retirement benefits received by either spouse; CSRS yes, FERS no
Estate / inheritance taxNone

Probate: reasonable fees and a $100,000 affidavit

Idaho is a UPC state — compensation is “reasonable” (Idaho Code §15-3-719), no percentage schedule. Small estates: up to $100,000 of personal property (net of liens) passes by affidavit (Idaho Code §15-3-1201) after a 30-day wait; summary procedures are also available for a surviving spouse. Context: probate cost by state · small-estate limits by state.

Is Idaho a good state to retire in for taxes?

Middling by design: Social Security rides free, but the flat 5.3% on all withdrawals — with no age-based exclusion — puts Idaho behind neighbors like Wyoming and Nevada (no income tax) and Utah (4.45% with an SS credit) for portfolio retirees, while CSRS and military retirees do meaningfully better. No death taxes and clean UPC probate keep the estate side simple. The 5.3% figure itself is the thing to get right — plenty of coverage still quotes 5.695% or even 5.8%.

Does Idaho tax Social Security? All 51 jurisdictions, 202643 do not tax Social Security at any income level. 8 tax it only above an income or age limit. Idaho is in the first group.Does Idaho tax Social Security? All 51jurisdictions, 202643 do not tax Social Security at any incomelevel. 8 tax it only above an income or agelimit.Idaho is in the first group.Not taxed at any income (43)Taxed only above a limit (8)ALAKAZARCACOCTDEDCFLGAHIIDILINIAKSKYLAMEMDMAMIMNMSMOMTNENVNHNJNMNYNCNDOHOKORPARISCSDTNTXUTVTVAWAWVWIWYPostal abbreviations, alphabetical. TheDistrict of Columbia is counted as ajurisdiction, which is why the total is 51 andnot 50.Counted from Clear Money Guide’s 2026 51-jurisdictionretirement-tax table, where every row carries its statutecitation. Table read 2026-08-17.
Idaho is one of 43 jurisdictions that do not tax Social Security at any income level in 2026. The other 8 exempt benefits only up to an income or age limit. Full rules and statutes: the 51-state table.

Idaho vs. common alternatives

StateSocial SecurityPension / 401(k) / IRAEstate taxInheritance tax
IdahoNot taxedFully taxable at flat 5.3% (narrow gov-plan deduction)NoneNone
UtahCredit fully offsets tax below $54k/$90k MAGIFully taxable at flat 4.45%NoneNone
MontanaTaxed to the federally taxable extentFully taxable; $5,500 subtraction at 65+NoneNone
NevadaNot taxedNot taxed (no income tax)NoneNone

Comparison rows summarize general rules; see our 51-state retirement tax table for statute-cited detail.

Considering a Roth conversion? The converted amount is taxed as ordinary income in the year you convert, and Idaho may treat it differently from the retirement income above — see how all 51 jurisdictions tax Roth conversions.

Finding a financial advisor in Idaho

Per the SEC’s July 2026 Investment Adviser roster, Idaho has 52 SEC-registered advisory firms (#38 nationally) managing $48.0 billion (#44 by AUM). Full breakdown: Idaho advisor statistics. Reviewing fee structures: fee-drag calculator.

Thinking about moving?

Four taxes change when you move state in retirement, not one: income tax on withdrawals, state estate tax, state inheritance tax, and what probate costs your heirs. Corridor comparisons involving Idaho:

Moving to Idaho? See retiring to Idaho.

Compare any two states with the retirement tax comparison tool, or browse all corridors at the relocation hub.

What probate costs in Idaho

Idaho sets probate compensation by a “reasonable fee” standard with no percentage schedule, so anyone quoting a firm figure is estimating. And the small-estate shortcut of $100,000 does not clear a solely owned house on its own, which is the detail most guidance omits. Full detail with the governing statute, the court filing fee and the threshold: Idaho probate cost. To price a specific estate, use the probate cost calculator.

Cite or share this guide

Suggested citation: Clear Money Guide, “Idaho Retirement Taxes (2026 edition),” statute-cited; clearmoneyguide.com/idaho-retirement-taxes/. Free to cite with attribution and a link. Data verified July 23–24, 2026 against state statutes, session laws, and revenue-department guidance.

Figures verified against Idaho Code sections 63-3022A, 63-3024, 15-3-1201 and 15-3-719 and the Idaho State Tax Commission retirement benefits deduction page on September 30, 2026; the estate and inheritance tax status, the Social Security map count and the other-state comparison rows were not re-checked.

Primary sources

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